Thin, electromagnetic wave shielding laminate for displays and process for producing the same

Abstract

A thin, electromagnetic wave shielding laminate for displays, which is thin, light, excellent in flexibility, has improved resistance of its near-infrared reducing function to ultraviolet rays, heat and moisture, requires only a simple production process, easily produced, excellent in productivity and easily attached to a display, and process for producing the same, in which the thin, electromagnetic wave shielding laminate for displays with a mesh-shape electroconductive material having openings which is provided, at least on one side, with an optical film via an adhesive layer to form a monolithic structure, wherein (a) the optical film having a near-infrared reducing function is arranged on the display side from the mesh-shape electroconductive material, and (b) the openings of said mesh-shape electroconductive material or the openings and surface layer section are filled or coated with a transparent resin composition satisfying a specific optical requirement, and the process for producing the same.

What is claimed is:  
     
         1 . A thin, electromagnetic wave shielding laminate for displays with a mesh-shape electroconductive material having openings which is provided, at least on one side, with an optical film via an adhesive layer to form a monolithic structure, wherein 
 (a) said optical film having a near-infrared reducing function is arranged on the display side from said mesh-shape electroconductive material, and    (b) said openings of said mesh-shape electroconductive material or said openings and surface layer section are filled or coated with a transparent resin composition satisfying the optical requirement described as:      Tu/Tt= 0.001 to 0.2    wherein, Tt is total light transmittance, and Tu is an average transmittance in a wavelength range of 350 to 380 nm.    
     
     
         2 . The thin, electromagnetic wave shielding laminate according to  claim 1  for displays, wherein said transparent resin composition is composed of a hot-melt adhesive and ultraviolet absorber.  
     
     
         3 . The thin, electromagnetic wave shielding laminate according to  claim 2  for displays, wherein said hot-melt adhesive is composed of an ethylene/vinyl acetate copolymer-based resin or ethylene/acrylic acid ester copolymer-based resin.  
     
     
         4 . The thin, electromagnetic wave shielding laminate according to  claim 2  for displays, wherein said ultraviolet absorber is at least one type selected from the group consisting of a benzotriazoles- and benzophenones-, and incorporated at 1 to 10% by weight based on the whole transparent resin composition.  
     
     
         5 . The thin, electromagnetic wave shielding laminate for displays according to one of  claims 1  to  4 , wherein said optical film has at least one type of function selected from the group consisting of electromagnetic wave shielding, anti-reflection and anti-dazzling function, in addition to the near-infrared reducing function.  
     
     
         6 . The thin, electromagnetic wave shielding laminate for displays according to one of  claims 1  to  4 , wherein said near-infrared reducing function is provided by a near-infrared absorbing colorant or this colorant and a colorant having a color-adjusting relation thereto, incorporated in the transparent base polymer.  
     
     
         7 . The thin, electromagnetic wave shielding laminate for displays according to one of  claims 1  to  4 , wherein said laminate is 0.05 to 2 mm thick.  
     
     
         8 . A process for producing the thin, electromagnetic wave shielding laminate, wherein said mesh-shape electroconductive material is thermocompression-bonded to said adjacent optical film via at least one adhesive layer selected from the group consisting of a hot-melt adhesive film of transparent resin composition satisfying the optical requirement described below, and adhesive layer of the hot-melt adhesive film and a tackifier layer to form a monolithic structure wherein:  
         Tu/Tt= 0.001 to 0.2  
       wherein, Tt is total light transmittance, and Tu is an average transmittance in a wavelength range of 350 to 380 nm.  
     
     
         9 . The process according to  claim 8  for producing said thin, electromagnetic wave shielding laminate for displays, wherein said thermocompression bonding is carried out at 80 to 120° C.